The Conitel 2020 protocol was developed by Leeds&Northrup for communication between a SCADA system and RTUs of the same vendor.
Physical layer encoding is based on 32-bit words.
Conitel 2020 operates in half-duplex mode following the master/slave principle. A master can communicate with up to 15 RTUs, an RTU only responds to explicit requests by the master.
7 | Application Layer | Conitel-2020 Application Layer |
6 | Presentation Layer | n/a |
5 | Session Layer | n/a |
4 | Transport Layer | n/a |
3 | Network Layer | n/a |
2 | Link Layer | n/a |
1 | Physical Layer | PCM, 32 bit RS232 (V.24) |
Physical Layer
PCM, half-duplex, 32 bit data words
Application Layer
on-demand transmission of analog and counter values
on-demand transmission of single point indications with change detection
"Select before operate" transmission of commands and indications
Address Space
RTU addresses 1..15
up to 16 groups with up to 16 12-bit-words each
Softwarepackage for conversion between OPC DA 3.0 Server and standard protocols
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